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📄 boot.c(9.81 KB)
📄 bootstrap.h(12.21 KB)
📄 commands.c(11.33 KB)
📄 console.c(7.79 KB)
📄 dev_net.c(10.62 KB)
📄 dev_net.h(1.48 KB)
📄 devopen.c(2.36 KB)
📄 disk.c(11.71 KB)
📄 disk.h(4.1 KB)
📄 gfx_fb.c(67.01 KB)
📄 gfx_fb.h(8.12 KB)
📄 help.common(13.34 KB)
📄 install.c(8.46 KB)
📄 interp.c(4.62 KB)
📄 interp_backslash.c(3.35 KB)
📄 interp_forth.c(12.43 KB)
📄 interp_lua.c(5.31 KB)
📄 interp_parse.c(4.8 KB)
📄 interp_simple.c(4.77 KB)
📄 isapnp.c(7.77 KB)
📄 isapnp.h(10.19 KB)
📄 load_elf.c(33.26 KB)
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📄 md.c(3.64 KB)
📄 merge_help.awk(2.11 KB)
📄 metadata.c(9.89 KB)
📄 misc.c(4.04 KB)
📄 module.c(38.98 KB)
📄 newvers.sh(2.31 KB)
📄 nvstore.c(6.57 KB)
📄 part.c(24.07 KB)
📄 part.h(2.65 KB)
📄 paths.h(1.74 KB)
📄 pnp.c(3.76 KB)
📄 rbx.h(1.97 KB)
📄 readin.h(1.68 KB)
📄 reloc_elf.c(6.05 KB)
📄 reloc_elf32.c(98 B)
📄 reloc_elf64.c(98 B)
📄 self_reloc.c(3.72 KB)
📄 vdisk.c(9.47 KB)
📄 zfs_cmd.c(2.66 KB)

Editing: interp_parse.c

/*-
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * Jordan K. Hubbard
 * 29 August 1998
 *
 * The meat of the simple parser.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <stand.h>
#include <string.h>
#include "bootstrap.h"

static void	 clean(void);
static int	 insert(int *argcp, char *buf);
static char	*variable_lookup(char *name);

#define PARSE_BUFSIZE	1024	/* maximum size of one element */
#define MAXARGS		20	/* maximum number of elements */
static char		*args[MAXARGS];

/*
 * parse: accept a string of input and "parse" it for backslash
 * substitutions and environment variable expansions (${var}),
 * returning an argc/argv style vector of whitespace separated
 * arguments.  Returns 0 on success, 1 on failure (ok, ok, so I
 * wimped-out on the error codes! :).
 *
 * Note that the argv array returned must be freed by the caller, but
 * we own the space allocated for arguments and will free that on next
 * invocation.  This allows argv consumers to modify the array if
 * required.
 *
 * NB: environment variables that expand to more than one whitespace
 * separated token will be returned as a single argv[] element, not
 * split in turn.  Expanded text is also immune to further backslash
 * elimination or expansion since this is a one-pass, non-recursive
 * parser.  You didn't specify more than this so if you want more, ask
 * me. - jkh
 */

#define PARSE_FAIL(expr) \
	if (expr) { \
		printf("fail at line %d\n", __LINE__); \
		clean(); \
		free(copy); \
		free(buf); \
		return 1; \
	}

/* Accept the usual delimiters for a variable, returning counterpart */
static char
isdelim(int ch)
{

if (ch == '{')
		return '}';
	else if (ch == '(')
		return ')';
	return '\0';
}

static int
isquote(int ch)
{

return (ch == '\'');
}

static int
isdquote(int ch)
{

return (ch == '"');
}

int
parse(int *argc, char ***argv, const char *str)
{
	int ac;
	char *val, *p, *q, *copy = NULL;
	size_t i = 0;
	char token, tmp, quote, dquote, *buf;
	enum { STR, VAR, WHITE } state;

ac = *argc = 0;
	dquote = quote = 0;
	if (!str || (p = copy = backslash(str)) == NULL)
		return 1;

/* Initialize vector and state */
	clean();
	state = STR;
	buf = (char *)malloc(PARSE_BUFSIZE);
	token = 0;

/* And awaaaaaaaaay we go! */
	while (*p) {
		switch (state) {
		case STR:
			if ((*p == '\\') && p[1]) {
				p++;
				PARSE_FAIL(i == (PARSE_BUFSIZE - 1));
				buf[i++] = *p++;
			} else if (isquote(*p)) {
				quote = quote ? 0 : *p;
				if (dquote) { /* keep quote */
					PARSE_FAIL(i == (PARSE_BUFSIZE - 1));
					buf[i++] = *p++;
				} else
					++p;
			} else if (isdquote(*p)) {
				dquote = dquote ? 0 : *p;
				if (quote) { /* keep dquote */
					PARSE_FAIL(i == (PARSE_BUFSIZE - 1));
					buf[i++] = *p++;
				} else
					++p;
			} else if (isspace(*p) && !quote && !dquote) {
				state = WHITE;
				if (i) {
					buf[i] = '\0';
					PARSE_FAIL(insert(&ac, buf));
					i = 0;
				}
				++p;
			} else if (*p == '$' && !quote) {
				token = isdelim(*(p + 1));
				if (token)
					p += 2;
				else
					++p;
				state = VAR;
			} else {
				PARSE_FAIL(i == (PARSE_BUFSIZE - 1));
				buf[i++] = *p++;
			}
			break;

case WHITE:
			if (isspace(*p))
				++p;
			else
				state = STR;
			break;

case VAR:
			if (token) {
				PARSE_FAIL((q = strchr(p, token)) == NULL);
			} else {
				q = p;
				while (*q && !isspace(*q))
					++q;
			}
			tmp = *q;
			*q = '\0';
			if ((val = variable_lookup(p)) != NULL) {
				size_t len = strlen(val);

strncpy(buf + i, val, PARSE_BUFSIZE - (i + 1));
				i += min(len, PARSE_BUFSIZE - 1);
			}
			*q = tmp;	/* restore value */
			p = q + (token ? 1 : 0);
			state = STR;
			break;
		}
	}
	/* missing terminating ' or " */
	PARSE_FAIL(quote || dquote);
	/* If at end of token, add it */
	if (i && state == STR) {
		buf[i] = '\0';
		PARSE_FAIL(insert(&ac, buf));
	}
	args[ac] = NULL;
	*argc = ac;
	*argv = (char **)malloc((sizeof(char *) * ac + 1));
	bcopy(args, *argv, sizeof(char *) * ac + 1);
	free(buf);
	free(copy);
	return 0;
}

#define MAXARGS	20

/* Clean vector space */
static void
clean(void)
{
	int		i;

for (i = 0; i < MAXARGS; i++) {
		if (args[i] != NULL) {
			free(args[i]);
			args[i] = NULL;
		}
	}
}

static int
insert(int *argcp, char *buf)
{

if (*argcp >= MAXARGS)
		return 1;
	args[(*argcp)++] = strdup(buf);
	return 0;
}

static char *
variable_lookup(char *name)
{

/* XXX search "special variable" space first? */
	return (char *)getenv(name);
}

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Editing: interp_parse.c

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